Add this javascript code to ensure visitors can't hit your submit button twice - a habit that has driven me nuts in the past!
<script type="text/javascript">
function subOnce(obj)
{
obj.disabled=true;
return true;
}
</script>
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In any form on your webpage, use the following code for your submit button:
<input type="submit" value="Send" onclick="return subOnce()">
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Many thanks to Curtis for posting this code - my initial code for this tip was buggy and more complex.
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